Okay for arena, meh for constructed.
The card is good against zoo aggro decks, but leaves much to be desired against control, face and combo, essentially a dead card against decks that don’t rely on tokens. Assuming you use this in an ideal board state with a full board you would still need to combo this with other cards to be effective, the heal alone isn’t much if you fail to clear the board since at that point you’re staring down the barrel of a bloodlust or savage roar.
even pirate warrior can reasonably ignore a decent use of this card, as the tempo loss of not developing your board early means the heal from this is often irrelevent. Unless there is some awesome follow up priest cards to come, I would recommend just using tar creeper over this.

I agree… this card is nice but I think won’t be enough to counter aggro decks and weak against other kind of gameplay
Tar Keeper is more reliable and flexible
Unless we will have a good spell damage creature for priest …??

Besides the obvious, (spell damage combos, pirate warrior counter), I think this card is the most interesting because it opens up the possibility of healing your minions – something only pyromancer did up to this point. While its synergy with northsire + circle has already been pointed out, I feel obliged to reinforce how much more efficient this card could make the priest draw engine.

On a different note, dou you guys think Holy Fire will be converted to have Lifesteal? It would technically be a slightly different mechanic, but it was immediately the card that popped into my mind when I read about Lifesteal 🙂
Not that Holy Fire is any good, but still.

No it will not. Holy Fire interacts differently with divine shield than lifesteal does. So if you hit a dshielded minion (or animated armor) you will still gain 5 life, whereas with lifesteal you would not gain any life, because no damage was dealt.

Right on the money with the Lyra (and radiant elemental) synergies, I totally forgot to mention how low-cost priest spells are generally really strong due to those cards. I also totally love the fact that this deals damage to your minions as well – I guess this could essentially make Acolyte playable in priest? I don’t think you’d need it, but the possibility is there. I feel this card would be alright even without the Lifesteal, just because how versatile it makes my Priest combos. Ofc, with Lifesteal it becomes one of the most promising priest spells ever.

Lifesteal is quite an interesting try to solve the problem of the aggro decks. I feel it really needs to be combined with the right card effects to make it just strong enough. I fear it might either end up as too little for countering these decks, or too much, and will make everything but OTK/Fatigue decks unplayable. So yeah, we’ll have to see how accessible/conveniet the mechanic is for certain classes, though it is perfectly placed on this card.

Will work with Pyromancer as well as Thalnos for a nice 4 mana 2 damage board clear, this card combined with a few other staples will practically guarantee that there will always be some sort of useful clear on hand.

It has very good synergy with bloodmage for a deserved 4 mana boardclear in priest. With the upside of healing the hero it is comparable to maelstrom portal 2 mana 1 damage board clear with upside and the lifesteal aspect is like the shaman legendary.
I think blizzard will try to make a very strong deathrattle priest with this card. It has very good synergy with bloodmage(loothoarder is now staple)for a deserved 4 mana 2 damage aoe in priest, that heals a lot. Also great with extra health to not waste any health point.

As the new heros upgrade the heropower, I expect that the deathknight priest hero will synergy with velen. As for rounding up they may add some more cards with spell damage to priest. Would be likely after the previous priest spell expansion and the previous arguments. This lets me expect that priest will be a controll deck with deathrattle quest, spell damage, velens and the new priest hero.

Even if it doesn’t kill anything… Spirit Lash > Northshire Cleric > Circle of Healing; it’s a 3 card combo but for 3 mana, against something like token Druid, you’re going to get a reasonable amount of health and a lot of card draw.

I am curious if this will lead to Enrage Priest decks popping up. Throw in some enrage or damage benefit cards, throw some health buffs cards, and maybe some healing cards and you ight get a pretty effective deck.